Solar tracking and concentration device

ABSTRACT

A solar tracking and concentration device, including a reflecting unit, a receiving unit, a controlling device, and a plurality of photo sensors, is provided. The receiving unit is used to receive the sunlight reflected and reflected by the reflecting unit. The receiving unit and the reflecting unit face each other. The receiving unit is adapted to move along a first direction. According to the position and the time of the reflecting unit, the controlling device controls a rotation angle of a support element and controls a first moving position of the receiving unit moving along the first direction, in which the support element supports the reflecting unit and the receiving unit. The photo sensors are used to detect the sunlight reflected by the reflecting unit to the receiving unit, and are adapted to output a first feedback signal to calibrate a direction of the receiving unit facing the reflecting unit.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the priority benefit of Taiwan applicationserial no. 97134723, filed Sep. 10, 2008. The entirety of theabove-mentioned patent application is hereby incorporated by referenceherein and made a part of specification.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention generally relates to a tracking and concentrationdevice, in particular, to a solar tracking and concentration device.

2. Description of Related Art

Solar energy is a renewable and pollution free energy source, and isalways the center of attention during the process of solving the recentpollution and shortage problem of the petrochemical energy source.Particularly, a solar panel has a photovoltaic cell (PV cell), so thesolar panel may directly convert the optical energy to the electricenergy. However, recently it is a quite important research topic how tomake the solar panel have the higher photoelectric conversionefficiency.

Generally speaking, if the solar panel may face the sun at any moment,the photoelectric conversion efficiency of the conventional solar panelwhich is fixedly disposed may be greatly improved by 25% to 40%. Inaddition, with the rotation of the Earth, the moving position of the suneveryday is from east to west, and an inclination angle between theearth's rotation axis and the ecliptic is 23.5 degrees, such that themoving position of the sun of the whole year is from south to north.Therefore, if it intends to exactly track the sun to obtain the higherphotoelectric conversion efficiency, at least a uniaxial solar trackingdevice must be used, such that the solar panel is made to effectivelyface the sun.

In addition, if the sunlight is concentrated to improve the intensity ofthe light irradiating on the solar panel per unit area, thephotoelectric conversion efficiency of the solar panel may be greatlyimproved. For example, in the recently well-known high concentrationphotovoltaic (HCPV) solar panel system, the total photoelectricconversion efficiency is improved in the manner of concentrating thesunlight.

However, in the conventional solar tracking and concentration device,usually the operation thereof is controlled by adopting a relativelycomplicated mechanical actuation, and thus the fabricating cost isincreased and the complexity during the operation is increased, therebyreducing the reliability.

SUMMARY OF THE INVENTION

Accordingly, the present invention is directed to a solar tracking andconcentration device, which has preferred photoelectric conversionefficiency, and relatively simpler solar tracking mechanism, therebyreducing the fabricating cost.

The present invention is also directed to a solar tracking andconcentration device, which has a relatively stable mechanical actuationmechanism during operation besides the above-mentioned efficacies.

The present invention is further directed to a solar concentrationdevice, which has a simpler solar concentration mechanism and a lowerfabricating cost.

The present invention provides a solar tracking and concentrationdevice, which includes a reflecting unit, a receiving unit, acontrolling device, and a plurality of photo sensors. The reflectingunit reflects and concentrates sunlight. The receiving unit receives thesunlight reflected by the reflecting unit. The receiving unit and thereflecting unit face each other. The receiving unit is adapted to movealong a first direction. The controlling device is adapted to control arotation angle of a support element and control a first moving positionof the receiving unit moving along the first direction according to aposition and a time of the reflecting unit, in which the support elementsupports the reflecting unit and the receiving unit. The photo sensorsare disposed on the periphery of the receiving unit, for example,corners or surrounding edges. The photo sensors detect the sunlightreflected by the reflecting unit to the receiving unit, and are adaptedto output a first feedback signal to calibrate a direction of thereceiving unit facing the reflecting unit.

The present invention also provides a solar tracking and concentrationdevice, which includes a plurality of reflecting units, a receivingunit, a controlling device, and a plurality of photo sensors. Thereflecting units reflect and concentrate sunlight, in which eachreflecting unit has a reflecting surface. The receiving unit receivesthe sunlight reflected by one of the reflecting units, in which thereceiving unit and one of the different reflecting units face each otherunder different times. In addition, the receiving unit is adapted tomove along a first direction. The controlling device is adapted tocontrol a rotation angle of the receiving unit facing one of thereflecting units and control a first moving position of the receivingunit moving along the first direction according to positions of thereflecting units and the time. The photo sensors are disposed on theperiphery of the receiving unit, for example, corners or surroundingedges, in which the photo sensors detect the sunlight reflected by oneof the reflecting units to the receiving unit, and are adapted to outputa first feedback signal to the controlling device to calibrate adirection of the receiving unit facing one of the reflecting units.

The present invention further provides a solar tracking andconcentration device, which includes a reflecting unit, a receivingunit, a controlling device, and an inclination sensing device. Thereflecting unit reflects and concentrates sunlight, and has a reflectingsurface. The receiving unit receives the sunlight reflected by thereflecting unit, and has a receiving surface, in which the receivingunit and the reflecting unit face each other. The controlling devicecontrols a rotation angle of the reflecting unit according to a positionand a time of the reflecting unit. The inclination sensing device isdisposed on the receiving unit to detect an inclination direction of thereflecting unit, and is adapted to output a first feedback signal to thecontrolling device to calibrate a direction of the reflecting unitfacing the sun.

The present invention further provides a solar concentration device,which includes a reflecting unit, a plurality of receiving units, and asupport element. The reflecting unit reflects and concentrates sunlight,and has a reflecting surface. The plurality of receiving units each hasdifferent heights to respectively receive sunlight reflected by thereflecting unit under different times. Each receiving unit has areceiving surface, in which each receiving surface faces the reflectingsurface. The support element supports the reflecting unit and thereceiving units.

In an embodiment of the present invention, the controlling deviceincludes a real time clock (RTC), a micro control unit (MCU), a memorystorage unit, a tracking control unit, a first rotation control unit,and an input/output unit. The RTC is adapted to generate a time signalof the reflecting unit. The MCU generates a control sequence signalaccording to a position signal of the reflecting unit and the timesignal. The memory storage unit stores the position signal, the timesignal, and the control sequence signal. The tracking control unit isadapted to accept the control sequence signal to respectively controlthe first moving position of the receiving unit moving along the firstdirection, and to control the first direction of the receiving unit. Thefirst rotation control unit is adapted to accept the control sequencesignal to control the rotation angle of the support element connectingthe reflecting unit and the receiving unit. The input/output unit isadapted to deliver the first feedback signal of the photo sensors tocalibrate the direction of the receiving unit facing the reflectingunit.

To sum up, the solar tracking and concentration device of the presentinvention is adapted to control the receiving unit to move along thefirst direction to receive the sunlight reflected and concentrated bythe reflecting unit, and to control the rotation angle of the supportelement connecting the reflecting unit and the receiving unit, accordingto the position and the time of the reflecting unit, such that the solartracking and concentration device has a preferred photoelectricconversion efficiency and a three-dimensional solar tracking mechanism.

In addition, the solar tracking and concentration device may further usea plurality of reflecting units, control the receiving unit to movealong the first direction, and control the rotation angle of thereceiving unit facing one of the plurality of reflecting units,according to the positions and the times of the reflecting units, suchthat the receiving unit may receive the sunlight reflected by thereflecting units at any moment under different times, so as to achieve asimple tracking mechanism. In other words, the solar tracking andconcentration device of the present invention has a preferredphotoelectric conversion efficiency, a simpler solar tracking mechanism,and a stable mechanical actuation. In addition, the present inventionalso provides a solar tracking and concentration method having theabove-mentioned efficacies.

In order to have a further understanding of the above and otherobjective, features, and efficacies of the present invention, a detaileddescription is given below with embodiments and accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings are included to provide a furtherunderstanding of the invention, and are incorporated in and constitute apart of this specification. The drawings illustrate embodiments of theinvention and, together with the description, serve to explain theprinciples of the invention.

FIG. 1A is a schematic side view of a solar tracking and concentrationdevice according to a first embodiment of the present invention.

FIG. 1B is a schematic view in which a reflecting unit of FIG. 1Areflects sunlight to a receiving unit.

FIG. 1C is a systematic block diagram of the solar tracking andconcentration device of FIG. 1A.

FIGS. 2A to 2C are flow charts of processes of an actuation of the solartracking and concentration device from morning to noon.

FIGS. 2D to 2E are flow charts of processes of the actuation of thesolar tracking and concentration device from noon to afternoon.

FIG. 3A is a schematic view of the actuation of the solar tracking andconcentration device in spring and autumn.

FIG. 3B is a schematic view of the actuation of the solar tracking andconcentration device in winter.

FIG. 4 is a schematic view of the solar tracking and concentrationdevice according to another implementation aspect of the presentinvention.

FIG. 4A is a schematic view of an inclination sensing device of FIG. 4.

FIG. 4B is a schematic view of another inclination sensing device ofFIG. 4.

FIG. 5 is a block flow diagram of processes of a solar tracking andconcentration method according to an embodiment of the presentinvention.

FIG. 6A is a schematic side view of the solar tracking and concentrationdevice according to a second embodiment of the present invention.

FIG. 6B is a schematic side view of the solar tracking and concentrationdevice according to another implementation aspect.

FIG. 6C is a systematic block diagram of the solar tracking andconcentration device of FIG. 6A or 6B.

FIG. 7A is a schematic side view of the solar tracking and concentrationdevice according to a third embodiment of the present invention.

FIG. 7B is a systematic block diagram of the solar tracking andconcentration device of FIG. 7A.

FIG. 8A is a schematic view in which the reflecting unit reflects thesunlight to the receiving unit in a morning time period.

FIG. 8B is a schematic view in which the reflecting unit reflects thesunlight to the receiving unit in an afternoon time period.

FIG. 8C is a schematic view in which the reflecting unit reflects thesunlight to the receiving unit at summer noon.

FIGS. 8D and 8E are schematic flow charts in which a rotation angle ofthe reflecting unit is adjusted to reflect the sunlight to the receivingunit at winter noon.

FIG. 9A is a schematic view in which a solar concentration devicereflects the sunlight at summer noon.

FIG. 9B is a schematic view in which the solar concentration devicereflects the sunlight at winter noon.

DESCRIPTION OF THE EMBODIMENTS

Reference will now be made in detail to the present embodiments of theinvention, examples of which are illustrated in the accompanyingdrawings. Wherever possible, the same reference numbers are used in thedrawings and the description to refer to the same or like parts.

First Embodiment

FIG. 1A is a schematic side view of a solar tracking and concentrationdevice according to a first embodiment of the present invention.Referring to FIG. 1A, a solar tracking and concentration device 100 ofthis embodiment includes a reflecting unit 110, a receiving unit 120, acontrolling device 130, and a plurality of photo sensors 140. Thereflecting unit 110 reflects and concentrates sunlight 110 a. Thereceiving unit 120 receives the sunlight 110 a reflected by thereflecting unit 110. The receiving unit 120 and the reflecting unit 110are disposed face to face, and the receiving unit 120 is adapted to movealong a first direction 122, as shown in FIG. 1A.

Referring to FIG. 1A, the controlling device 130 controls a rotationangle 152 of a support element 150 and controls a first moving position122 a of the receiving unit 120 moving along the first direction 122,according to a position and a time of the reflecting unit 110. Thesupport element 150 supports the reflecting unit 110 and the receivingunit 120. The photo sensors 140 are disposed on the periphery 120 a ofthe receiving unit 120, for example, corners or surrounding edges. Thephoto sensors 140 detect the sunlight 110 a reflected by the reflectingunit 110 to the receiving unit 120, and are adapted to output a firstfeedback signal 142 to the controlling device 130 to calibrate adirection of the receiving unit 120 facing the reflecting unit 110.

In this embodiment, the controlling device 130 calculates the currentposition of the sun according to the position and the time of thereflecting unit 110, so as to directly control the rotation of thereflecting unit 110 and the receiving unit 120 through the firstrotation control unit 135, and to control the receiving unit 120 to movealong the first direction 122, such that the reflecting unit 110 mayeffectively reflect the sunlight 110 a to the receiving unit 120. Inother words, the solar tracking and concentration device 100 of thisembodiment has a three-dimensional actuation mechanism toomni-directionally track the sun.

In this embodiment, in addition to reflecting the sunlight 110 a, thereflecting unit 110 may further concentrate the sunlight 110 a on thereceiving unit 120. In other words, the reflecting unit 110 may improvethe intensity of the light received by the receiving unit 120 per unitarea, such that the solar tracking and concentration device 100 has apreferred photoelectric conversion efficiency. In addition, in the solartracking and concentration device 100, the photo sensors 140 are furtherdisposed on the receiving unit 120, so as to calibrate the direction ofthe receiving unit 120 facing the reflecting unit 110. In this manner,the solar tracking and concentration device 100 may track the sun moreexactly, thereby improving the total performance.

In the following, connection relations of various members and theactuation mechanism of the solar tracking and concentration device 100of this embodiment are described in detail.

FIG. 1B is a schematic view in which the reflecting unit of FIG. 1Areflects the sunlight to the receiving unit. Referring to FIGS. 1A and1B, the reflecting unit 110 of this embodiment has a plurality ofreflecting mirrors 112, and each reflecting mirror 112 is adapted toreflect the sunlight 110 a on the receiving unit 120.

Particularly, the reflecting unit 110 may have differentimplementations, such that each reflecting mirror 112 of the reflectingunit 110 may reflect the sunlight 110 a on the receiving unit 120. Forexample, if a surface of the reflecting unit 110 is a plane, and theplurality of reflecting mirrors 112 is disposed on the plane, theplurality of reflecting mirrors 112 is adapted to have differentinclination angles (not shown), such that each reflecting mirror 112 mayreflect the sunlight 110 a on the receiving unit 120. Alternatively, thesurface of the reflecting unit 120 is a curved surface (for example, acurved surface shape of a concave mirror), and the plurality ofreflecting mirrors 112 is disposed on the curved surface, the reflectingmirrors 112 may be directly disposed on or attached to the curvedsurface, so as to reflect the sunlight 110 a on the receiving unit 120.In addition, according to different demands of the users, the reflectingmirrors 112 may adopt other disposing manners and design manners, theabove description is only exemplary, instead of limiting the presentinvention. In this embodiment, the reflecting mirrors 112 reflect thesunlight 110 a on the receiving unit 120, and a total area of thereflecting mirrors 112 is larger than a sensing area of the receivingunit 120, thus improving the intensity of the light sensed by thereceiving unit 120 per unit area.

In this embodiment, the reflecting mirror 112 may be a plane mirror, asshown in FIG. 1B. In an embodiment, the reflecting mirror 112 may alsobe a concave mirror, in which the manner of disposing the concave mirroron the reflecting unit 110 uses, for example, the above-mentionedconcept, so it is not repeated here. In another embodiment, thereflecting unit 110 may be a concave mirror, in which the concave mirroris adapted to reflect and concentrate the sunlight 110 on the receivingunit 120.

Referring to FIGS. 1A and 1B, the solar tracking and concentrationdevice 100 may be affected by the external environment, for example,wind or shock, to result in offset and error of the direction of thereceiving unit 120 facing the reflecting unit 110, thus affecting theintensity of the light received by the receiving unit 120 per unit area.In order to avoid the above situation, in the solar tracking andconcentration device 100, the plurality of photo sensors 140 is disposedon the corners of the receiving unit 120 to detect and calibrate thedirection of the receiving unit 120 facing the reflecting unit 110, asshown in FIGS. 1A and 1B. Alternatively, the photo sensors 140 may berespectively disposed around the receiving unit 120, for example,symmetrically disposed on the four edges.

Particularly, the photo sensors 140 sense the light intensitydistribution of the sunlight 110 a irradiating on the receiving unit120, so as to determine whether the direction of the receiving unit 120facing the reflecting unit 110 is calibrated or not according to thelight intensity distribution. In this embodiment, the photo sensors 140may be disposed on the four corners of the receiving unit 120, as shownin FIG. 1A or 1B. If the four photo sensors 140 sense the same lightintensity value, it indicates that the receiving unit 120 effectivelyfaces the reflecting unit 110. On the contrary, it indicates thatreceiving unit 120 is calibrated faces the reflecting unit 110. In otherwords, when the four photo sensors 140 sense different light intensityvalues, it is necessary to appropriately adjust the direction of thereceiving unit 120 facing the reflecting unit 110 until the lightintensity values detected by the four photo sensors 140 are the same. Inthis embodiment, the direction of the receiving unit 120 facing thereflecting unit 110 may be calibrated and adjusted by adjusting thereceiving unit 120 to move along the first direction 122, or byadjusting the rotation angle 152 of the support element 150.

In the above-mentioned, as an implementation example, the photo sensors140 are disposed on the four corners of the receiving unit 120. However,according to the design and the demand of the user, the photo sensors140 may also be disposed on the receiving unit 120 at other positions,and the above-mentioned is only an exemplary description. Preferably,the photo sensors 140 may be symmetrically arranged on the receivingunit 120 in pairs.

In this embodiment, the receiving unit 120 may be a photoelectric unitadapted to convert the sunlight 110 a to an electric energy. Forexample, the photoelectric unit may be a solar panel or otherappropriate photoelectric devices. In this embodiment, as animplementation example, the photoelectric unit is, but not limited to,the solar panel.

In another implementation aspect, the receiving unit 120 may be aphoto-thermal unit adapted to convert the sunlight 110 a to a thermalenergy. For example, the photo-thermal unit may be a heating device. Inan implementation aspect, the heating device uses, for example, water asa medium. That is to say, when the sunlight 110 a irradiates on thewater, water molecules are adapted to accept the energy of the sunlight110 a, so as to raise the water temperature. Accordingly, the denser thesunlight 110 a irradiating on the water is, the higher the energyobtained by the water molecules is, and the higher the water temperatureis.

In addition, FIG. 1C is a systematic block diagram of the solar trackingand concentration device of FIG. 1A. Referring to FIGS. 1A and 1C, inthis embodiment, the controlling device 130 includes a real time clock(RTC) 131, a micro control unit (MCU) 132, a memory storage unit 133, atracking control unit 134, a first rotation control unit 135, and aninput/output unit 136.

In this embodiment, the RTC 131 is adapted to generate a time signal ofthe reflecting unit 110, and the time signal may be delivered to the MCU132 or the memory storage unit 133. The MCU 132 generates a controlsequence signal according to a position signal of the reflecting unit110 and the time signal, the position signal may be generated by the MCU132 or by an external positioning generator (not shown), and isdelivered to the MCU 132. The position signal is one selected from amonga longitude signal, a latitude signal, and a height signal of thereflecting unit 11, or a combination thereof.

In addition, the memory storage unit 133 stores the position signal, thetime signal, and the control sequence signal. In an embodiment, thememory storage unit 133 delivers the control sequence signal to thetracking control unit 134. In this embodiment, the tracking control unit134 is adapted to accept the control sequence signal to control thefirst moving position 122 a of the receiving unit 120 moving along thefirst direction 122, and to control the direction of the receiving unit120 facing the reflecting unit 110. The first rotation control unit 135is adapted to accept the control sequence signal to control the rotationangle 152 of the support element 150. The support element 150 connectsthe reflecting unit 110 and the receiving unit 120, as shown in FIG. 1Aor 1B. The input/output unit 136 is adapted to deliver the firstfeedback signal 142 of the photo sensor 140 to calibrate the directionof the receiving unit 120 facing the reflecting unit 110.

In view of the above-mentioned, the solar tracking and concentrationdevice 100 of this embodiment predict the current position of the sunaccording to the position and the time thereof, and the reflecting unit110 reflects and concentrates the sunlight 110 a on the receiving unit120. In addition, it is determined whether the direction of thereceiving unit 120 facing the reflecting unit 110 is calibrated or notthrough the first feedback signal 142 of the photo sensor 140, such thatthe receiving unit 120 may be calibrated face forwards the reflectingunit 110. In this embodiment, the direction of the reflecting unit 110facing the sun is a fixed direction, in which the direction is definedto be a normal vector on the reflecting surface of the reflecting unit110, and the positions of the sun are different under different times.

In addition, under different times, the positions of the reflecting unit110 concentrating the sunlight 110 a are different with the change ofthe position of the sun. In order to make the receiving unit 120 receivethe preferred intensity of the light per unit area, the receiving unit120 is adapted to move along the first direction 122 under differenttimes to receive the reflected and concentrated sunlight 110 a. In thisembodiment, the first direction 122 is a vertical direction. In anotherembodiment, the first direction 122 may also be a direction with aninclination angle with respect to a horizontal direction, in which theinclination angle depends on the shape of the support element.

In this embodiment, the controlling device 130 further includes a datatransmission device 137, as shown in FIG. 1C. The data transmissiondevice 137 is adapted to load the position signal to the controllingdevice 130. In addition, for example, the data transmission device 137may be, but not limited to, a serial port device or a parallel portdevice. In another not shown embodiment, for example, the datatransmission device 137 may be, but not limited to, a serial port devicewith wireless data transmission, for example, a plug-and-play devicewith blue tooth transmission or a plug-and-play device with infraredtransmission.

In this embodiment, the controlling device 130 further includes a globalpositioning system (GPS) receiver 138 a or a broadcast system receiver138 b, as shown in FIG. 1C. Particularly, the GPS receiver 138 a or thebroadcast system receiver 138 b receives an external frequencymodulation (FM) signal or a GPS broadcast signal, so as to adjust orcalibrate the time signal of the RTC 131. The broadcast system receiver138 b may be an FM broadcast system receiver.

In order to make the solar tracking and concentration device 100 have apreferred tracking and concentration mechanism everyday, the actuationmechanism on that day is described in detail.

FIGS. 2A to 2C are flow charts of processes of an actuation of the solartracking and concentration device from morning to noon. Firstly,Referring to FIG. 2A, according to the position and the time of thereflecting unit 110, the reflecting unit 110 has a direction facing thesun 101, in which the direction is a fixed direction. That is, thereflecting unit 110 is fixed on the support element 150. In addition,according to the position and the time of the reflecting unit 110, thecontrolling device 130 controls the receiving unit 120 to move along thefirst direction 122, for example, moves the receiving unit 120 to thefirst moving position 122 a to receive the sunlight 110 a reflected bythe reflecting unit 110 at that time.

Next, referring to FIG. 2B, as time goes by, the position of the sun 101slowly rises. In FIG. 2B, the direction of the reflecting unit 110facing the sun 101 is not changed with the rise of the sun (as thereflecting unit 110 is fixed on the support element 150). Therefore,according to the optical reflection law, an incident angle (not shown)of the sunlight 110 a incident to the reflecting unit 110 is changedwith the time. In this manner, according to the position of the sun 101under different times, the control unit 130 moves the receiving unit 120to the first moving position 122 b to receive the sunlight 110 areflected by the reflecting unit 110, as shown in FIG. 2B, and the firstmoving position 122 b is lower than the first moving position 122 a.

Then, referring to FIG. 2C, at noon, the sun 101 is located on thehighest position on that day. Similarly, as the reflecting unit 110 isfixed on the support element 150, the receiving unit 120 is adapted tomove to the first moving position 122 c to receive the sunlight 110 areflected by the reflecting unit 110. The manner of moving the receivingunit 120 is controlled by the controlling device 130, and the detaileddescription is as the above-mentioned, so it is not repeated here. Itshould be noted that the first moving position 122 c is lower than thefirst moving position 122 b.

In view of the above, from morning to noon, the controlling device 130controls the receiving unit 120 to move along the first direction 122(that is, to move along a direction from the first moving position 122 ato the first moving position 122 b then to the first moving position 122c), so as to receive the sunlight 110 reflected by the reflecting unit110 under different times. In this time period, the receiving unit 120slowly falls as time goes by, such that receiving unit 110 may receivethe preferred intensity of the light per unit area under differenttimes. Therefore, the solar tracking and concentration device 100 hasthe preferred photoelectric conversion efficiency.

In addition, FIGS. 2D to 2E are flow charts of the actuation of thesolar tracking and concentration device from noon to afternoon. In FIG.2C, after the noon, it may be found that the sun 101 is located on theback of the reflecting unit 110, at this time, the reflecting unit 110cannot reflect the sunlight 110 a on the receiving unit 120. Therefore,the controlling device 130 is adapted to control the first rotationcontrol unit 135 (as shown in FIG. 1A or 1B) to rotate the supportelement 150 connecting the reflecting unit 110 and the receiving unit120, such that the reflecting unit 110 and the receiving unit 120 mayrotate for an angle at the same time, and the reflecting unit 110 mayface the sun 101 again, thereby reflecting and concentrating thesunlight 110 a to the receiving unit 120. The receiving unit 120 isadapted to be controlled by the control unit 130 to move to the firstmoving position 122 d, as shown in FIG. 2D.

Referring to FIG. 2E, when the sun slowly falls from the highestposition at noon, the incident angles of the sunlight 110 a incident tothe reflecting unit 110 are different with the different positions ofthe sun, in this manner, the control unit 130 is adapted to move thereceiving unit 120 to the first moving position 122 e to receive thesunlight 110 a reflected and concentrated by the reflecting unit 110, asshown in FIG. 2E. In other words, according to the optical reflectionlaw, it is intuitively known that the first moving position 122 e ishigher than the first moving position 122 d, as shown in FIGS. 2D and2E. Therefore, from noon to afternoon, the receiving unit 120 is adaptedto move along a direction from the first moving position 122 d to thefirst moving position 122 e (that is, the receiving unit 120 slowlyrises), so as to receive the sunlight 110 a reflected and concentratedby the reflecting unit 120 under different times.

To sum up, the solar tracking and concentration device 100 controls thereceiving unit 120 to move along the first direction 122 to receive thesunlight 110 a reflected by the reflecting unit 110 in the two timeperiods before noon and after noon on that day, and rotates the supportelement 150 connecting the reflecting unit 110 and the receiving unit120 through the first rotation control unit 135. Therefore, thereflecting unit 110 may continuously reflect the sunlight 110 a duringdifferent time periods and concentrate the sunlight 110 a on thereceiving unit 120 by only rotating the whole solar tracking andconcentration device 100 once, such that the receiving unit 110 maycontinuously receive the preferred intensity of the light per unit area,thereby improving the photoelectric conversion efficiency of the solartracking and concentration device.

In addition, an inclination angle between the earth's rotation axis andthe ecliptic is 23.5 degrees, such that in different seasons, thehighest positions of the sun are different. For example, when the solartracking and concentration device 100 is disposed on the position ofnorth latitude 23.5 degrees, the sun directly irradiates on the positionof north latitude 23.5 degrees in summer, so the highest position of thesun in summer is right above the solar tracking and concentrationdevice, and the sun rises along the right east direction and falls alongthe right west direction. In spring and autumn, the sun directlyirradiates on the equator, so the highest position of the sun in springand autumn is lower than the highest position of the sun in summer, andthe sun rises along the east by south direction and falls along the westby south direction.

Therefore, in order to make the solar tracking and concentration device100 have the preferred tracking and concentration mechanism during thewhole year, the actuation mechanisms in different seasons are describedin detail as follows, in which the solar tracking and concentrationdevice 100 is, for example, but not limited to, disposed on the positionof north latitude 23.5 degrees.

FIG. 3A is a schematic view of the actuation of the solar tracking andconcentration device in spring and autumn, and FIG. 3B is a schematicview of the actuation of the solar tracking and concentration device inwinter. Referring to FIG. 3A, in the spring and autumn, the sun risesalong the east by south direction and falls along the west by southdirection. Therefore, from morning to noon, the reflecting unit 110 isadapted to face the direction of east by south 23.5 degrees. That is,the first rotation control unit 135 is adapted to rotate the supportelement 150 to make the reflecting unit 110 face the direction of eastby south 23.5 degrees, as shown in FIG. 3A. From noon to afternoon, thefirst rotation control unit 135 is adapted to rotate the support element150 to make the reflecting unit 110 face the direction of west by south23.5 degrees, as shown in FIG. 3B, such that the sunlight 110 a may bereflected to the receiving unit 120.

In addition, referring to FIG. 3B, the sun rises along the east by southdirection and falls along the west by south direction in winter.Therefore, from morning to noon, the reflecting unit 110 is adapted toface the direction of east by south 47 degrees to face the sun 101. Thatis, the first rotation control unit 135 is adapted to rotate the supportelement 150 to the east by south 47 degrees to make the reflecting unit110 face the direction of east by south 47 degrees, as shown in FIG. 3B.From noon to afternoon, the first rotation control unit 135 is adaptedto rotate the support element 150 to west by south 47 degrees, that is,the reflecting unit 110 is made to face the direction of west by south47 degrees, as shown in FIG. 3B. In winter, the sun rises and fallsrelatively along south, so in addition to rotating the support element150 once to make the reflecting unit facing the east by south 47degrees, at noon, the first rotation control unit 135 may further rotatethe support element 150 to make the reflecting unit 110 face the rightsouth, and next rotate the support element 150 to make the reflectingunit 110 face the east by south 47 degrees, as shown in FIG. 3B.

In view of the above, in addition to make the solar tracking andconcentration device 100 track the sun during different time periods,the first rotation control unit 135 may further track the sun during thewhole year through different rotation angles, such that the receivingunit 120 may have the preferred intensity of the light per unit yearduring the whole year.

It should be noted that, as an example, the solar tracking andconcentration device 100 is located on the position of north latitude23.5 degrees, so as to describe the actuation manners of the solartracking and concentration device 100 in different seasons. However,those of ordinary skill in the art may know that the solar tracking andconcentration device 100 of the present invention may be used on otherlatitudes and positions.

In addition, FIG. 4 is a schematic view of the solar tracking andconcentration device according to another implementation aspect of thepresent invention. Referring to FIG. 4, a solar tracking andconcentration device 100′ is similar to the solar tracking andconcentration device 100, the same members are marked by the samereference numerals, and the same parts are not repeated. The differenceof the two is that the controlling device further includes a secondrotation control unit 160, as shown in FIG. 4. The second rotationcontrol unit 160 is adapted to accept the control sequence signal tocontrol the rotation angle 162 of the reflecting unit 110.

In addition, the solar tracking and concentration device 100′ furtherincludes an inclination sensing device 170, as shown in FIG. 4. Theinclination sensing device 170 is disposed on the reflecting unit 110 todetect an inclination direction (not shown) of the reflecting unit 110.In addition, the inclination sensing device 170 is adapted to output asecond feedback signal 172 to the controlling device 130 to calibratethe direction of the reflecting unit 110 facing the sun according to theinclination direction. That is to say, the controlling device 130determines whether the direction of the reflecting unit 110 facing thesun controlled by the controlling device 130 is calibrated or notaccording to the inclination direction, and calibrates the direction.

FIG. 4A is a schematic view of an inclination sensing device of FIG. 4,and FIG. 4B is a schematic view of another inclination sensing device ofFIG. 4. Referring to FIG. 4A, in this embodiment, the inclinationsensing device 170 includes a first containing area 176 extending alonga second direction 174 and a first moving member 176 a disposed in thefirst containing area 176. The first moving member 176 a moves along thesecond direction 174. A plurality of first sensing members 176 b isdisposed in the first containing area 176. The first sensing members 176b sense a second moving position of the first moving member 176 a. Inthis embodiment, the shape of the first containing area 176 is an arc,and the first sensing members 176 b are uniformly disposed in the firstcontaining area 176, as shown in FIG. 4A. The inclination sensing deviceof the present invention is an example, and those skilled in the artshould know that other types of inclination sensing devices may also beused in the present invention, for example, a G-sensor.

Particularly, when the reflecting unit 110 is inclined along the seconddirection 174, the first moving member 176 a is affected by the earthgravity, such that the first moving member 176 a moves in the firstcontaining area 176, at this time, the first sensing members 176 b areadapted to sense the second moving position of the first moving member176 a, so as to obtain a first inclination angle of the reflecting unit110 along the second direction 174 by conversion. In this embodiment,the second direction 174 may be an east-to-west direction or awest-to-east direction.

In addition, the inclination sensing device 170 further includes asecond containing area 178 extending along a third direction 175 and asecond moving member 178 a disposed in the second containing area 178.The second moving member 178 a moves along the third direction 175. Aplurality of second sensing members 178 b is disposed in the secondcontaining area 178. The second sensing members 178 b sense a thirdmoving position of the second moving member 178 a. In this embodiment,the shape of the second containing area 178 is an arc, and the secondsensing members 178 b are uniformly disposed in the second containingarea 178, as shown in FIG. 4A.

Particularly, when the reflecting unit 110 is inclined along the thirddirection 175, the second moving member 178 a is affected by the earthgravity, such that the second moving member 178 a moves in the secondcontaining area 178, and the second sensing members 178 b are adapted tosense the third moving position of the second moving member 178 a, so asobtain a second inclination angle of the reflecting unit 110 along thethird direction 175. In this embodiment, the third direction 175 may bea south-to-north direction or a north-to-south direction.

In view of the above, the inclination sensing device 170 obtains thedirection of the reflecting unit 110 facing the sun according to thefirst inclination angle and/or the second inclination angle, so as tooutput the second feedback signal 172 to the controlling device 130 todetermine whether the reflecting unit is calibrated face the sun or not,thereby calibrating the direction of the reflecting unit 110 facing thesun.

In another embodiment, the shape of the first containing area of theinclination sensing device may be a linear design, as shown in FIG. 4B.In this embodiment, the inclination sensing device 170′ may only detectwhether the reflecting unit 110 is parallel to the second direction 174or not at noon. That is to say, when the first moving member 176 a stopson a central position 177 of the first containing area 176, it indicatesthat the controlling device 130 controls the direction of the reflectingunit 110 facing the sun. On the contrary, the rotation angle 162 of thereflecting unit 110 should be adjusted to make the first moving member176 a locate on the central position of the first containing area 176,so as to finish the calibrating mechanism.

In this embodiment, the solar tracking and concentration device 100′similarly has the actuation mechanism of the solar tracking andconcentration device 100, as the actuation mechanism of FIGS. 2A to 2E,or the actuation mechanism of FIGS. 3A to 3E. In addition, the solartracking and concentration device 100′ uses the second rotation controlunit 160 to rotate the direction of the reflecting unit 110 facing thesun 101, so as to appropriately adjust the moving distance of thereceiving unit 120 along the first direction 122.

For example, during the actuation process of FIGS. 2A to 2C, as thereflecting unit 110 is fixed on the support element 150, the receivingunit 120 is adapted to move along the first direction 122, for example,to move from the first moving position 122 a to the first movingposition 122 c, along with the different positions and heights of thesun, and the related illustration is described above. However, the solartracking and concentration device 100′ has the second rotation controlunit 160, such that the reflecting unit 110 is adapted to rotate on thesupport element 150, as shown in FIG. 4. In this manner, along with thedifferent heights of the sun, the angle of the reflecting unit 110 isappropriately rotated to reflect the sunlight 110 a, such that themoving distance of the receiving unit 120 along the first direction 122may be reduced. In another embodiment, the receiving unit 120 may alsonot move, and only the angle of the reflecting unit 110 is rotated toreflect the sunlight 110 a on the receiving unit 120. Definitely, forexample, the height of the receiving unit moving along the firstdirection and the rotating angle of the reflecting unit all depend onthe demand of the user, and the present invention is not limitedthereto.

FIG. 5 is a block flow chart of a solar tracking and concentrationmethod according to an embodiment of the present invention. Referring toFIGS. 5 and 1A, in this embodiment, the receiving unit 120 is controlledto move along a direction (for example, the first direction 122) toreceive the sunlight 110 a reflected by the reflecting unit 110.Firstly, in steps S110 and S120, a position signal and a time signal ofthe position and the time of the reflecting unit 110 are respectivelyobtained.

In this embodiment, the method of generating the position signalincludes, for example, delivering the position signal by a datatransmission device. The position signal includes a longitude signal, alatitude signal, and a height signal. In addition, the data transmissiondevice may be a serial port device or a parallel port device. Inaddition, the method of generating the time signal includes, forexample, using an RTC to generate the time signal of the reflectingunit.

Next, in step S130, a control sequence signal is generated by using thetime signal and the position signal. In this embodiment, the controlsequence signal is generated by, for example, an MCU. The MCU calculatesthe track of the sun on that day according to the time signal and theposition signal of the reflecting unit.

Then, in step S140, according to the control sequence signal, therotation angle of the support element is controlled, and the firstmoving position of the receiving unit moving along a direction iscontrolled as well, in which the support element connects the reflectingunit and the receiving unit. In this embodiment, the rotation angle ofthe support element is controlled by, for example, a hydraulic motor.The hydraulic motor is adapted to accept the control sequence signal toadjust the direction of the reflecting unit facing the sun. In addition,the receiving unit is controlled to move along a direction by, forexample, a stepping motor. The stepping motor is adapted to accept thecontrol sequence signal to control the receiving unit to move along adirection move and control the direction of the reflecting unit facingthe sun. Definitely, the hydraulic motor and the stepping motor aredescribed as an example, the present invention is not limited thereto,and the user may also use other appropriate manners.

Next, in step S150, a plurality of photo sensors detect the lightintensity distribution of the sunlight received by the receiving unit.In this embodiment, the photo sensors are disposed on four corners ofthe receiving unit, and are symmetrically arranged with the center ofthe receiving unit as a center, as shown in FIG. 1A or 1B.

Then, in step S160, according to the light intensity distribution, afeedback signal is output to calibrate the direction of the receivingunit facing the reflecting unit or the direction of the reflecting unitfacing the sun. Particularly, the process of calibrating the directionof the receiving unit facing the reflecting unit includes the followingsteps. Firstly, in step S161, a first light intensity of the photosensors arranged along a first lateral direction on the receiving unitis detected. Next, in step S162, a second light intensity of the photosensors arranged along a second lateral direction opposite to the firstlateral direction on the receiving unit is detected. Then, in step 163,it is compared whether the first light intensity and the second lightintensity are the same or not. In step 164, if the first light intensityis different from the second light intensity, the first feedback signalis output to the control unit to calibrate the direction of thereceiving unit facing the reflecting unit until the first lightintensity and the second light intensity are the same.

After finishing the above steps, next, the process of calibrating thedirection of the reflecting unit facing the sun includes the followingsteps. Firstly, in step S165, a third light intensity of the photosensors arranged along a first longitudinal direction on the receivingunit is detected, in which the first lateral direction is vertical tothe first longitudinal direction. Next, in step S166, a fourth lightintensity of the photo sensors arranged along a second longitudinaldirection opposite to the first longitudinal direction on the receivingunit is detected, in which the second lateral direction is vertical tothe second longitudinal direction. Then, in step 167, it is comparedwhether the third light intensity and the fourth light intensity are thesame. In step 168, if the third light intensity is different from thefourth light intensity, the second feedback signal is output to thecontrol unit to calibrate the direction of the receiving unit facing thesun until the third light intensity and the fourth light intensity arethe same. Until now, the method applicable to the solar tracking andconcentration device 100 or 100′ is approximately finished.

Second Embodiment

FIG. 6A is a schematic side view of the solar tracking and concentrationdevice according to a second embodiment of the present invention, andFIG. 6B is a schematic side view of the solar tracking and concentrationdevice according to another embodiment. Referring to FIGS. 6A and 6B, asolar tracking and concentration device 200 or 200′ includes a pluralityof reflecting units 210, a receiving unit 220, a controlling device 230,and a plurality of photo sensors 240.

In this embodiment, the solar tracking and concentration device 200 or200′ adopts the concept similar to that of the solar tracking andconcentration device 100 or 100′, except that the structure is partiallydifferent. For example, for the identical parts, the solar tracking andconcentration device 200 or 200′ makes the receiving unit 220 move alongthe first direction 222 to receive the sunlight 110 a reflected by thereflecting units 210 under different times. For the different parts, forexample, the solar tracking and concentration device 200 or 200′ uses aplurality of reflecting units 210 to reflect the sunlight 110 a duringdifferent time periods without rotating the reflecting unit to face thesun (for example, the actuation mechanism of the solar tracking andconcentration device 100), in which the different time periods are, forexample, morning or afternoon, as shown in FIGS. 6A and 6B. In thisembodiment, the first direction 222 is, for example, the same as thefirst direction 122, and the related description may be obtained withreference to the above embodiment.

In other words, the solar tracking and concentration device 200 or 200′uses the plurality of reflecting units 210 to reflect the sunlight 110 aat different time periods, simultaneously moves the receiving unit 220to the position opposite to the reflecting units 210 to receive thesunlight 110 a reflected by the reflecting units 210, and controls thereceiving unit 220 to move along the first direction 222 to receive thesunlight 110 a reflected by the reflecting units 210 under differenttimes during the time period, as shown in FIGS. 6A and 6B.

In the following, the connection relations of various members and theactuation mechanism of the solar tracking and concentration device 200or 200′ are described in detail, but the parts similar to those of thesolar tracking and concentration device 100 are not repeated.

In this embodiment, the reflecting units 210 reflect and concentrate thesunlight 110 a, in which each reflecting unit 210 has a reflectingsurface 210 a, as shown in FIG. 6A. Particularly, the structure and thefunction of the reflecting unit 210 are similar to those of thereflecting unit 110, and the related description may be obtained withreference to the above embodiment. It should be noted that the solartracking and concentration device 200 or 200′ has the plurality ofreflecting units 210, and the reflecting surfaces 210 a of thereflecting units 210 are disposed back to back, as shown in FIG. 6A. Inanother embodiment, the reflecting surfaces 210 a of the reflectingunits 210 are disposed face to face, as shown in FIG. 6B. In thismanner, the reflecting units 210 may reflect the sunlight 110 a to thereceiving unit 220 during different time periods (for example, the timeperiods of morning and afternoon), without using the first rotationcontrol unit 135 to rotate the reflecting unit 110. It should be notedthat although the increasing of the reflecting units 210 may be helpfulto reflect the sunlight 110 a in different seasons, the fabricating costis increased. Therefore, the number of the reflecting units 210 isdetermined according to the demand of the user, and the presentinvention is not limited here.

In this embodiment, the receiving unit 220 receives the sunlight 110 areflected by one of the reflecting units 210, in which the receivingunit 220 face one of the reflecting units 210 under different times, andthe receiving unit 220 is adapted to move along a first direction 222,as shown in FIGS. 6A and 6B. Particularly, the structure and thefunction of the receiving unit 220 are similar to those of the receivingunit 120, and the related description may be obtained with reference tothe above embodiment. It should be noted that under different timeperiods, the control unit 230 is adapted to rotate or move the positionof the receiving unit 220 to make the receiving unit 220 face one of thereflecting units 210, so as to receive the sunlight 110 a reflected bythe reflecting unit 210 at that time, as shown in FIGS. 6A and 6B.

Similarly, in order to improve the photoelectric conversion efficiencyof the solar tracking and concentration device 200 or 200′, that is, toeffectively reflect the sunlight on the receiving unit 220, theplurality of photo sensors 240 is disposed on the periphery 224 of thereceiving unit 220, for example, corners or surrounding edges. Themanner of disposing the photo sensors and the application are similar tothose of the photo sensors 140. Particularly, the photo sensors detectthe sunlight 110 a reflected by one of the reflecting units 220 to thereceiving unit 220, and are adapted to output a first feedback signal242 to the controlling device 230 to calibrate the direction of thereceiving unit 220 facing the reflecting units 220, and the moredetailed description may be obtained with referent to the description ofthe photo sensors 140 of the above embodiment, so it is not repeatedhere.

In addition, FIG. 6C is a systematic block diagram of the solar trackingand concentration device of FIG. 6A or 6B. Referring to FIGS. 6A, 6B,and 6C, in this embodiment, the controlling device 230 includes an RTC231, an MCU 232, a memory storage unit 233, a tracking control unit 234,a first rotation control unit 235, and an input/output unit 236.

In this embodiment, the description of the function of various membersof the controlling device 230 is similar to that of the controllingdevice 130, so the same parts may be obtained with reference to thedescription of the above embodiment, and it is not repeated here. Forthe different parts, the first rotation control unit 235 is adapted toaccept the control sequence signal to control the rotation angle 252 ofthe receiving unit 220 facing one of the reflecting units 210.Particularly, the sun tracking and concentration device 100 or 100′ usesthe first rotation control unit 135 to rotate the rotation angle 152 ofthe support element 150, so as to rotate the reflecting unit 110 and thereceiving unit 120 at the same time to enable the receiving unit 120continuously receive the sunlight 110 a during different time periods,and the related description may be obtained with reference to the aboveembodiment. The solar tracking and concentration device 200 of thisembodiment uses the first rotation control unit 235 to only rotate therotation angle 252 of the receiving unit 220 to enable the receivingunit 220 face the different reflecting units 210 during different timeperiods to receive the sunlight 110 a, referring to FIGS. 6A, 6B, and6C.

Similarly, the controlling device 230 further includes a datatransmission device 237, as shown in FIG. 6C. In this embodiment, thedata transmission device 237 is identical to the data transmissiondevice 137, and the related description may be obtained with referenceto the above embodiment, so it is not repeated here. In addition, thecontrolling device 230 further includes a GPS receiver 238 a or abroadcast system receiver 238 b, as shown in FIG. 6C. In thisembodiment, the GPS receiver 238 a or the broadcast system receiver 238b is the same as the GPS receiver 138 a or the broadcast system receiver138 b, and the related description may be obtained with reference to theabove embodiment, so it is not repeated here.

In addition, the solar tracking and concentration device 200 or 200′ ofthis embodiment adopts the concept similar to that of the solar trackingand concentration device 100 or 100′, so the actuation mechanism ofFIGS. 2A to 2E may be used to describe the actuation mechanism of thesolar tracking and concentration device 200 and 200′ everyday, exceptthat it is only necessary to rotate the receiving unit 220 to face thereflecting unit, on which the sun irradiates at that time, so as toreceive the sunlight, and the related description may be obtained withreference to the above embodiment, so it is not repeated here.

Likewise, the actuation mechanism in different seasons of FIGS. 3A and3B may also be used to describe the actuation mechanism of the solartracking and concentration device 200 or 200′ in different seasons,which may be known by those of ordinary skill in the art with referenceto the above related description, so it is not repeated here.

In addition, the controlling device 230 further includes a secondrotation control unit 260, as shown in FIGS. 6A and 6B. In thisembodiment, the second rotation control unit 260 is the same as thesecond rotation control unit 160, and the related description may beobtained with reference to the above embodiment, so it is not repeatedhere. In this manner, the solar tracking and concentration device 200 or200′ may also have the advantages of the solar tracking andconcentration device 100′.

It should be noted that if the solar tracking and concentration device200 or 200′ uses the second rotation control unit 260 to control therotation angle of the reflecting unit 210, at this time, the solartracking and concentration device 200 or 200′ further includes aninclination sensing device (not shown). The inclination sensing deviceis disposed on the reflecting unit 210, and is adapted to output asecond feedback signal (not shown) to calibrate the direction of thereflecting unit 210 facing the sun. In this embodiment, the inclinationsensing device is, for example, the inclination sensing device 170 or170′, the related description may be obtained with reference to theabove embodiment, so it is not repeated here.

It should be noted that the solar tracking and concentration method inthe above embodiment may also be used by the solar tracking andconcentration device 200 or 200′ of this embodiment, except that in stepS140, in this embodiment, the rotation angle of the receiving unitfacing one of the reflecting units is controlled according to thecontrol sequence signal, and the receiving unit is controlled to movealong a direction, and other steps are similar to that of the aboveembodiment, so will not be repeated here.

Third Embodiment

FIG. 7A is a schematic side view of the solar tracking and concentrationdevice according to a third embodiment of the present invention, andFIG. 7B is a systematic block diagram of the solar tracking andconcentration device of FIG. 7A. Referring to FIGS. 7A and 7B, a solartracking and concentration device 300 of this embodiment includes areflecting unit 310, a receiving unit 320, a controlling device 330, andan inclination sensing device 340.

In this embodiment, the reflecting unit 310 reflects and concentratesthe sunlight 110 a, and the reflecting unit 310 has a reflecting surface312. Particularly, the reflecting unit 310 is, for example, thereflecting unit 110 or 210, and the related description may be obtainedwith reference to the above embodiment, so it is not repeated here.

In addition, the receiving unit 320 receives the sunlight 110 areflected by the reflecting unit 310, the receiving unit 320 has areceiving surface 322, and the receiving surface 322 faces thereflecting surface 312, as shown in FIG. 7A. In this embodiment, thereceiving unit 320 is, for example, the receiving unit 120 or 220, andthe related description may be obtained with reference to the aboveembodiment, so it is not repeated here.

In this embodiment, the inclination sensing device 340 is disposed onthe reflecting unit 310 to detect the inclination direction of thereflecting unit 310, and the inclination sensing device 340 is adaptedto output a first feedback signal 342 to the controlling device 330 tocalibrate the direction of the reflecting unit 310 facing the sun, asshown in FIGS. 7A and 7B. For example, the inclination sensing device340 is, for example, the inclination sensing device 170 or 170′, and therelated description may be obtained with reference to the aboveembodiment, so it is not repeated here.

In this embodiment, the controlling device 330 controls the rotationangle 352 of the reflecting unit 310 according to the position and thetime of the reflecting unit 310, such that the reflecting unit 310 isadapted to effectively reflect the sunlight 110 a to the receiving unit320, as shown in FIG. 7A.

Particularly, the controlling device 330 includes an RTC 331, an MCU332, a memory storage unit 333, a first rotation control unit 334, andan input/output unit 335, as shown in FIG. 7B. In this embodiment, theRTC 331, the MCU 332, and the memory storage unit 333 are, for example,the RTC 131 or 231, the MCU 132 or 232, and the memory storage unit 133or 233, and the related description may be obtained with reference tothe above embodiment, so it is not repeated here.

In addition, the first rotation control unit 334 is adapted to acceptthe control sequence signal to control the rotation angle 352 of thereflecting unit 310 to enable the reflecting unit 310 reflect thesunlight 110 a to the receiving unit 320, as shown in FIGS. 7A and 7B.In addition, the input/output unit 335 is adapted to deliver the firstfeedback signal 342 of the inclination sensing device 340 to calibratethe direction of the reflecting unit 310 facing the sun, as shown inFIGS. 7A and 7B.

In this embodiment, the controlling device 330 may further includes adata transmission device 336, as shown in FIG. 7B. In this embodiment,the data transmission device 336 is, for example, the data transmissiondevice 137 or 237, and the related description may be obtained withreference to the above embodiment, so it is not repeated here. Inaddition, the controlling device 330 further includes a GPS receiver 337a or a broadcast system receiver 337 b, as shown in FIG. 7B. In thisembodiment, the GPS receiver 337 a or the broadcast system receiver 337b is the same as the GPS receiver 138 a or 238 a or the broadcast systemreceiver 138 b or 238 b, and the related description may be obtainedwith reference to the above embodiment, so it is not repeated here.

In addition, the solar tracking and concentration device 300 of thisembodiment is adapted to be used in a high latitude region (for example,the latitude is larger than 23.5 degrees), and the reflecting surface ofthe reflecting unit 310 is made to face south or north, in which thesouth or north direction depends on whether the solar tracking andconcentration device 300 is disposed on the north latitude or the southlatitude. For example, when the solar tracking and concentration device300 is disposed on north latitude 55 degrees, the reflecting unit 310 isadapted to face the south, so as to reflect the sunlight 110 a to thereceiving unit 320. On the contrary, when the solar tracking andconcentration device 300 is disposed on south latitude 55 degrees, thereflecting unit 310 is adapted to face the north. It should be notedthat the latitude of 55 degrees is only an example, and the presentinvention is not limited here.

In the following, FIGS. 8A and 8B are used to describe the actuationmechanism of the solar tracking and concentration device 300 of thisembodiment, in which FIG. 8A is a schematic view in which the reflectingunit reflects the sunlight to the receiving unit in a morning timeperiod, and FIG. 8B is a schematic view in which the reflecting unitreflects the sunlight to the receiving unit in an afternoon time period.

Referring to FIGS. 8A and 8B, the solar tracking and concentrationdevice 300 is disposed on the high latitude region, so under differenttime periods, a moving direction of a light irradiation area L of thesunlight reflected to the receiving unit 320 is approximately the samewith the moving direction of the sun. For example, from morning to noon,the light irradiation area L of the sunlight 110 a reflected by thereflecting unit 310 to the receiving unit 320 is located on the rightside of the receiving unit 320, and moves towards the left side as thetime approaches noon. After the noon, the light irradiation area Lreflected to the receiving unit 320 slowly appears on the left side, andgradually moves towards the left side as time goes by, as shown in FIGS.8A to 8B. In this embodiment, a ratio of a width W1 of the reflectingunit 310 and a width W2 of the receiving unit 320 is appropriatelyadjusted to increase the light irradiation area L irradiating to thereceiving unit 320, thereby improving the total photoelectric conversionefficiency, in which the ratio of the width W1 of the reflecting unit310 and the width W2 of the receiving unit 320 depends on the demand ofthe user, and the present invention is not limited here. It should benoted that if the solar tracking and concentration device 300 isdisposed on the higher latitude, the moving amplitude of the lightirradiation area reflected to the receiving unit is lower, so as toreduce the light irradiation area which is not received by the receivingunit, thus having the preferred photoelectric conversion efficiency.

In addition, in the following, FIGS. 8C to 8E are used to describe theactuation mechanism of the solar tracking and concentration device indifferent seasons, in which FIG. 8C is a schematic view in which thereflecting unit reflects the sunlight to the receiving unit at summernoon, and FIGS. 8D and 8E are schematic flow charts in which therotation angle of the reflecting unit is adjusted to reflect thesunlight to the receiving unit at winter noon.

Firstly, referring to FIG. 8C, at noon, the solar tracking andconcentration device 300 is disposed on the high latitude, so the sun islocated on a south or north direction to the right above position of thereflecting unit 310, in which the south or the north depends on whetherthe solar tracking and concentration device 300 is located on the northlatitude or the south latitude. In FIG. 8C, the reflecting unit 310calibrated reflects the sunlight 110 a to the receiving unit 320, asshown in FIG. 8C. Next, referring to FIG. 8D, in winter, if the relativeposition of the reflecting unit 310 and the receiving unit 320 is as thedesign in summer and remains unchanged, at this time, the sun is locatedon the south or north direction to the right above position of thereflecting unit 310, that is, the zenith position of the sun at noon islower, in this manner, the position on which the reflecting unit 310reflects the sunlight 110 a to the receiving unit 320 may generate anoffset, such that the receiving unit 320 may not effectively receive thereflected sunlight 110 a, as shown in FIG. 8D. Therefore, the solartracking and concentration device 300 is adapted to use the firstrotation control unit 334 to rotate the reflecting unit 310 to enablethe reflected sunlight irradiate on the receiving unit, as shown in FIG.8E. It should be noted that the rotation direction of the reflectingunit is, for example, the south-to-north direction or the north-to-southdirection.

To sum up, in the solar tracking and concentration device 300, thereflecting unit is rotated to calibrate the position on which thereflecting unit reflects the sunlight to the receiving unit in fourseasons, such that the receiving unit may receive the preferred lightirradiation intensity at any moment. In addition, the solar tracking andconcentration device is disposed on the high latitude region, so as toobtain the preferred light utilization rate without rotating any meanson that day. In other words, the solar tracking and concentration devicehas the relatively simpler actuation mechanism, the relatively lowerfabricating cost, and the better photoelectric utilization rate.

Fourth Embodiment

FIG. 9A is a schematic view in which a solar concentration devicereflects the sunlight at summer noon, and FIG. 9B is a schematic view inwhich the solar concentration device reflects the sunlight at winternoon. Referring to FIGS. 9A and 9B, a solar concentration device 400 ofthis embodiment includes a reflecting unit 410, a plurality of receivingunits 420, and a support element 430.

In this embodiment, the reflecting unit 410 is used to reflect andconcentrate the sunlight 110 a, and the reflecting unit 410 has areflecting surface 412, as shown in FIG. 9A or 9B. Particularly, thereflecting unit 410 is, for example, the reflecting unit 110, 210, or310, and the related description may be obtained with reference to theabove embodiment, so it is not repeated here.

In this embodiment, the receiving units 420 each have different heightsH1, H2, and H3 to respectively receive the sunlight 110 a reflected bythe reflecting unit 410 under different times (summer or winter as shownin FIGS. 9A and 9B). In addition, the receiving unit 420 has a receivingsurface 422, and the receiving surface 422 faces the reflecting surface412, as shown in FIG. 9A or 9B. Particularly, the receiving unit is, forexample, the receiving unit 120, 220, and 320, and the relateddescription may be obtained with reference to the above embodiment, soit is not repeated here.

In this embodiment, the support element 430 supports the reflecting unit410 and the receiving unit 420, as shown in FIGS. 9A and 9B.Particularly, the structure of the support element of FIGS. 9A and 9B isonly an exemplary description, and other shapes of the support element430 are also available. In other words, the support element 430 mainlysupports the reflecting unit 410 and the receiving unit 420, and enableseach receiving unit 420 have different heights H1, H2, and H3 to receivethe sunlight 110 a reflected by the reflecting unit 410. Therefore, theshape is only required to satisfy the design, instead of being limitedto FIGS. 9A and 9B. In addition, in order to support the reflecting unit410 and the receiving unit 420, a material of the support element 430may be aluminium alloy, other alloys, or other appropriate weightcarrying materials.

In this embodiment, the solar concentration device 400 is applicable tothe high latitude region, for example, a region with the latitude largerthan 23.5 degrees. For example, the solar concentration device isdisposed on a position of north latitude 55 degrees, and the reflectingsurface of the reflecting unit is made to face a direction, in which thedirection is the south. In this manner, the reflecting unit 410 and thereceiving units 420 are fixed on the support element 430, and eachreceiving unit 420 has a different height H1, H2, or H3, so at summernoon, the sunlight are mostly reflected to the receiving unit 420 withthe lower height, as shown in FIG. 9A. At winter noon, the zenith heightof the sun is relatively lower, so the sunlight is mostly reflected tothe receiving unit 420 with the higher height, as shown in FIG. 9B. Inthe above-mentioned, the north latitude is an exemplary description, andthe present invention is not limited here.

In other words, the solar concentration device of this embodiment usesthe plurality of receiving units 420 with different heights, and enablesthe receiving units 420 face the reflecting unit 410 to receive thesunlight reflected by the reflecting units 410 under different times, inwhich the reflecting unit and the receiving units are fixed on thesupport element, as shown in FIG. 9A or 9B. In this manner, the solarconcentration device 400 may effectively reflect the sunlight 110 awithout any complicated tracking device, thus having preferredphotoelectric conversion efficiency or light utilization rate, and lowerfabricating cost.

To sum up, the solar tracking and concentration device of the presentinvention at least has the following efficacies. Firstly, the solartracking and concentration device uses the reflecting unit to reflect orconcentrate the sunlight, and uses the controlling device to control thereceiving unit to move along the first direction to receive thereflected and the concentrated sunlight according to the position andthe time of the reflecting unit, such that the receiving unit has thepreferred light intensity per unit area. In addition, the controllingdevice also controls the rotation angle of the support elementconnecting the reflecting unit and the receiving unit according to theposition and the time of the reflecting unit, such that the solartracking and concentration device has the three-dimensional solartracking mechanism.

In addition, the solar tracking and concentration device further has aplurality of reflecting units, and the controlling device controls thereceiving unit to move along the first direction and controls therotation angle of the receiving unit facing one of the plurality ofreflecting units according to the position and the time of thereflecting unit, such that the receiving unit may receive the sunlightreflected and concentrated by different reflecting units at any momentwithout rotating the reflecting units, so as to improve the actuationstability of the solar tracking and concentration device.

In other words, the solar tracking and concentration device of thepresent invention has a preferred photoelectric conversion efficiency, asimpler solar tracking mechanism, a stable actuation mechanismmechanical actuation mechanism, and a lower fabricating cost. Inaddition, the present invention further provides a method applicable tothe solar tracking and concentration device.

In addition, the solar concentration device of the present invention isdisposed on the high latitude region, and uses the plurality ofreceiving units to respectively receive the sunlight reflected by thereflecting unit under different times, in which the receiving units andthe reflecting unit are fixed on the support element. Particularly, thesolar concentration device may effectively reflect the sunlight to thereceiving unit without rotating any means, thereby having a simplerconcentration mechanism, a preferred light utilization rate, and a lowerfabricating cost.

It will be apparent to those skilled in the art that variousmodifications and variations can be made to the structure of the presentinvention without departing from the scope or spirit of the invention.In view of the foregoing, it is intended that the present inventioncover modifications and variations of this invention provided they fallwithin the scope of the following claims and their equivalents.

What is claimed is:
 1. A solar tracking and concentration device,comprising: a reflecting unit, reflecting and concentrating sunlight; areceiving unit, receiving the sunlight reflected by the reflecting unit,wherein the receiving unit and the reflecting unit face each other, andthe receiving unit is adapted to move along a first direction; acontrolling device, adapted to control a rotation angle of a supportelement and control a first moving position of the receiving unit movingalong the first direction according to a position and a time of thereflecting unit, wherein the support element supports the reflectingunit and the receiving unit; and a plurality of photo sensors, disposedon the periphery of the receiving unit, wherein the photo sensors detectthe sunlight reflected by the reflecting unit to the receiving unit, andare adapted to output a first feedback signal to calibrate a directionof the receiving unit facing the reflecting unit.
 2. The solar trackingand concentration device according to claim 1, wherein the firstdirection is a vertical direction.
 3. The solar tracking andconcentration device according to claim 1, wherein the reflecting unitcomprises a plurality of reflecting mirrors, and each reflecting mirroris adapted to reflect the sunlight on the receiving unit.
 4. The solartracking and concentration device according to claim 3, wherein eachreflecting mirror is a plane mirror.
 5. The solar tracking andconcentration device according to claim 3, wherein each reflectingmirror is a concave mirror.
 6. The solar tracking and concentrationdevice according to claim 1, wherein the reflecting unit is a concavemirror.
 7. The solar tracking and concentration device according toclaim 1, wherein the receiving unit is a photoelectric unit, adapted toconvert the received sunlight to an electric energy.
 8. The solartracking and concentration device according to claim 7, wherein thephotoelectric unit is a solar panel.
 9. The solar tracking andconcentration device according to claim 1, wherein the receiving unit isa photo-thermal unit, adapted to convert the sunlight to a thermalenergy.
 10. The solar tracking and concentration device according toclaim 1, wherein the controlling device comprises: a real time clock(RTC), adapted to generate a time signal of the reflecting unit; a microcontrol unit (MCU), generating a control sequence signal according to aposition signal of the reflecting unit and the time signal; a memorystorage unit, storing the position signal, the time signal, and thecontrol sequence signal; a tracking control unit, adapted to accept thecontrol sequence signal to control the first moving position of thereceiving unit moving along the first direction, and to control thedirection of the receiving unit facing the reflecting unit; a firstrotation control unit, adapted to control the rotation angle of thesupport element according to the control sequence signal, wherein thesupport element supports the reflecting unit and the receiving unit; andan input/output unit, adapted to deliver the first feedback signal ofthe photo sensors to calibrate the direction of the receiving unitfacing the reflecting unit.
 11. The solar tracking and concentrationdevice according to claim 10, wherein the position signal is oneselected from among a longitude signal, a latitude signal, and a heightsignal, or a combination thereof.
 12. The solar tracking andconcentration device according to claim 10, wherein the controllingdevice further comprises a data transmission device, adapted to load theposition signal to the controlling device.
 13. The solar tracking andconcentration device according to claim 12, wherein the datatransmission device is a serial port device or a parallel port device.14. The solar tracking and concentration device according to claim 10,wherein the controlling device further comprises a global positioningsystem (GPS) receiver or a broadcast system receiver, for calibrating orfine-tuning the time signal of the RTC.
 15. The solar tracking andconcentration device according to claim 10, wherein the controllingdevice further comprises a second rotation control unit, adapted toaccept the control sequence signal to control the rotation angle of thereflecting unit.
 16. The solar tracking and concentration deviceaccording to claim 15, further comprising an inclination sensing device,disposed on the reflecting unit to detect an inclination direction ofthe reflecting unit, and adapted to output a second feedback signal tothe controlling device to calibrate a direction of the reflecting unitfacing the sun.
 17. The solar tracking and concentration deviceaccording to claim 16, wherein the inclination sensing device comprisesa first containing area extending along a second direction and a firstmoving member disposed in the first containing area, a first sensingmember is disposed in the first containing area, the first sensingmember senses a second moving position of the first moving member todetect a first inclination angle of the reflecting unit along the seconddirection, and the first moving member moves along the second direction.18. The solar tracking and concentration device according to claim 17,wherein a plurality of first sensing members is further disposed in thefirst containing area.
 19. The solar tracking and concentration deviceaccording to claim 17, wherein the inclination sensing device furthercomprises a second containing area extending along a third direction anda second moving member disposed in the second containing area, aplurality of second sensing members is disposed in the second containingarea, the second sensing members sense a third moving position of thesecond moving member to detect a second inclination angle of thereflecting unit along the third direction, and the second moving membermoves along the third direction.
 20. The solar tracking andconcentration device according to claim 17, wherein the second directionis an east-to-west direction or a west-to-east direction.
 21. The solartracking and concentration device according to claim 19, wherein thethird direction is a south-to-north direction or a north-to-southdirection.